ery deed or other voluntary instrument which is presented for registration including the endorsement of a certificate of title, shall contain or have endorsed upon it, the full name, residence and post office address of the grantee or other person who acquires or claims an interest under such instrument.
Any change in the residence or post office address of such person shall be endorsed by the registrar upon the original instrument, upon receiving a written statement of such change, duly acknowledged. Notices and processes issued in relation to registered land after original registration may be served upon any person in interest by mailing them to the address so given, and shall be binding, whether he resides within or without Guam. The certificate of the clerk that he has served such notice shall be conclusive proof of such service; but the court may, in any case, order different or further service, by publication or otherwise.
SOURCE: CC ‘1157.52.

§ 29155. Instrument Purporting to Transfer, Lease, or
Encumber Registered Land: Effect of Filing.
A deed, mortgage, lease, or other instrument purporting to convey, transfer, mortgage, lease, charge, or otherwise deal with the registered land, or any estate or interest therein, or charge upon the same, other than a will or a lease not exceeding one (1) year where the land is in the actual possession of the lessee or his assigns, shall take effect only by way of contract between the parties thereto, and as authority to register the transfer, mortgage, lease, charge, or other dealing upon compliance with the terms of this Law. On the filing of such instrument, the land, estate, interest, or charge shall become transferred, mortgaged, leased, charged, or dealt with according to the purport and terms of the deed, mortgage, lease, or other instrument. The registrar will immediately, upon the filing of such instrument, stamp or write upon the original and duplicate certificates of title the word transferred, mortgaged, leased, or otherwise, as the case may require with the date of filing such instrument and sign such endorsement.
SOURCE: CC ‘1157.53.

See Sauget v. Villagomez (1955), 228 F.2d. 374.